That is a very good question! I have a thread on "Physical cannot be the cause of its own change" that you can find here. I, however, think that the same type of argument that is presented here applies to physical events as well. This means that horizontal causation is not possible if the events, whether physical or mental, are related. Therefore, we are left with vertical causation, which requires at least two substances, namely the Mind and matter.Do you think we can take your same argument and use it to show that physical to physical causation is not possible if physical events are related? — Leontiskos
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